#include<stdio.h>
int main() //using switch
{
	char tem;int sum=0;
	do
	{
		tem=getchar();
		switch(tem>=48&&tem<=57)
		{
			case 1:
				sum++;
			case 0:
				break;
		}
	}while(tem!='\n');
	printf("You just enter %d numbers.\n",sum);
	return 0;
}
